Benchmark Results: Energy Consumption (Idle/Load)
The FX-8150 can only reliably achieve higher clock rates when we apply more voltage to it. The result is better performance in the application benchmarks, but with the consequence of higher power consumption as frequency goes up. At idle, the differences are small, and range from 73 to 81 watts, which think is reasonable for an "eight-core" CPU.
Loaded up with benchmark applications, the differences in power consumption are much more pronounced. Up to about 4.0 GHz, the wattage increases only moderately. But from 4.5 GHz upwards, the power consumption rises dramatically, and any notion of power efficiency has to be abandoned.